<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        /* 盒子模型：就是说元素由几个部分组成
        margin 外边距
        pading 填充  可以改变元素的width,heigth
        border 边框 可以传:width style(solid/dotted) color
        content 自身的width,height */
        div{

            width: 50px;
            height:100px;
            background:red;
            margin-left:100px;
            margin-top:50px;
            margin-bottom:30px;
            padding-left:50px;
            padding-top:10px;
            padding-bottom:10px;
            border:10px dotted violet ;
        }
    </style>
</head>
<body>
<div></div>
<p>临界点！</p>
</body>
</html>